Tested this against an updated copy of Foundation and it fails there as well.
I think according to this - https://world.optimizely.com/blogs/bartosz-sekula/dates/2023/1/official-list-property-support/ They are more plain now. Just don't need EditorDescriptor and PropertyList at all.
The bug fixed in EPiServer.CMS.UI 12.19.0 (CMS-27369) still appears to not work for CollectionEditorDescriptor.
Here's a trimmed snippet that should illustrate the problem:
The Item Details modal currently still shows Values as a textarea: